bump to 2.23.0

v2.22.1 updated DB

Bump to 2.22.0

Bump version

Major change to --json output

update pubmlst dbs - 30 Jan 2020

Bump to 2.18.0

Update PubMLST 2019-10-18

travis - multiple env: on same line

Issue #86 | revcom novel alleles if -ve strand in genome